CNC presently has over 35 + different Fanuc input output modules in group stock and 6 different types of IO backplane - making CNC Electronics LLC a company worth knowing if you have a Fanuc control system with Fanuc's IO module and backplane fitted. The Fanuc I/O units that are available are for systems 11, 12, 15, 16, 18, 20 and 21 controls in M and T configurations. These parts are available for Exchange, in some cases new or used surplus.